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ANSI/AF&PA NDS-2005 National Design Specification (NDS) for Wood Construction,这个标准是关于美国木制品设计规范的,哪位板油有的话上传给我,谢谢!!!
Particle Size Analyzer is used to determine the size of particles. Particles are small in a wide range of sizes.They involve nearly all materials processed in industry,some are broad in size distribution and some are coarse in size itself.This is talking about the concepts of particle size and its measurement.Usually when we are talking about particle size distribution we mean cumulative distribution specifically cumulative undersize particle size distribution such as D10,D50,D90. Among which D90/D10 ratio is very important. In actual industry we usually see dry powders everywhere, however we also can see some particles in other forms such as emulsions, suspensions. When it comes to the error sources of particle size measurement, it involves the following procedures during sampling, dispersion as well as relevant measurement techniques.Some particles are fine, the finess of particles contributes the form and performance of the products. Sometime we also measure gas bubbles in medium, it is a good practice in particle size analysis.Particles are industrially processed from natural products and the knowledge of methods for particle characterization is very important for quality control. Some particle exist in liquid mixtures but under laser diffraction technology we can also give the mean diameter,median diameter.During the test we have to pay attention to the medium we use.Some particles are usually in monodisperse system or we call it monosized.
【作者】:赵娜萍, 余露山, 姚彤炜, 曾苏【摘要】:目的研究帕洛诺司琼的体外代谢,建立人肝微粒体中帕洛诺司琼的反相高效液相色谱测定法。方法帕洛诺司琼与人肝微粒体共孵育之后用乙醚提取,采用地非三唑为内标,以DiamonsilC18柱(4.6mm×200mm,5μm)为分析柱,0.01μmol.L-1KH2PO4(pH3.0)-甲醇(30∶70)为流动相,流速1.0mL.min-1,紫外检测波长为241nm。结果帕洛诺司琼在1~100μmol.L-1内线性关系良好(r=0.9999,n=5),检测限为0.05μmol.L-1(S/N≥3),定量限为(0.21±0.04)μmol.L-1(n=5)。方法提取回收率和方法回收率平均分别为89.7%和100.0%,日内,日间RSD均10%(n=5)。结论此法简便,准确,可用于研究帕洛诺司琼在人肝微粒体中的代谢。 【作者单位】:浙江大学药学院药物分析与药物代谢研究室; 浙江大学药学院药物分析与药物代谢研究室 杭州310058; 杭州310058;【关键词】:帕洛诺司琼; 高效液相色谱法;http://ng1.17img.cn/bbsfiles/images/2012/09/201209022110_388001_1838299_3.jpg